Griffith finds a ‘transforming principle.’

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Presentation transcript:

KEY CONCEPT DNA was identified as the genetic material through a series of experiments.

Griffith finds a ‘transforming principle.’ Griffith experimented with the bacteria that cause pneumonia. He used two forms: the S form (deadly) and the R form (not deadly). A transforming material passed from dead S bacteria to live R bacteria, making them deadly.

Avery identified DNA as the transforming principle. Avery isolated and purified Griffith’s transforming principle. Avery performed three tests on the transforming principle. Qualitative tests showed DNA was present. Chemical tests showed the chemical makeup matched that of DNA. Enzyme tests showed only DNA-degrading enzymes stopped transformation.

Hershey and Chase confirm that DNA is the genetic material. Hershey and Chase studied viruses that infect bacteria, or bacteriophages. They tagged viral DNA with radioactive phosphorus. They tagged viral proteins with radioactive sulfur. Tagged DNA was found inside the bacteria; tagged proteins were not.